For this job, we installed a 4 ton Lennox full system. We replaced the plenums and added a filter rack. Replaced all of the duct work and added more supply ducts. Reattached the drain, flue and gas with all new piping. We reinstalled the preexisting UV light. Installed a Lennox smart thermostat. Replaced the vibration pad to the outdoor unit. Brazed, leak tested, vacuumed and charged to the manufacturer specifications. Tested both heating and cooling modes work as intended and completed the walkthrough with the customer.